Our Slog (Ships Log) with a Satelite View

So what's the deal? 450 miles off shore and a ship comes from a bearing of 30 degrees off our stern and is crossing within 0.2 nm of our position. We haven't seen anything for almost 2 days and this guy shows up and tries to run us down. We tried hailing them (Northern Pola) on the radio with no response. Then we had to drive off course for about 2 miles before we were sure he would miss us. I thought we would be alone out here away from those guys.

On the plus side we have been making good progress and keeping good speed. However at about 4pm today we completely lost the wind and after flogging for some time I did a fuel count and decided we can still motor some more.
Nothings worse than when you are ripping along at 6+ knots and then the wind dies.

The winds have been quite weird. They seem to surge up and down rythmically. I started timing them and found a regular interval of 2.5 minutes weaker and 3.5 minutes stronger. This seems to be most dramatic at night. During the surges we hit 5.7 to 6.3 knots. The tempo changes throughout the day and night with the day getting longer weak times. Pretty odd.